Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.180..593f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 180, Sept. 1977, p. 593-612.
Astronomy and Astrophysics
Astronomy
5
Escape Velocity, Exosphere, Gas Evolution, Jeans Theory, Planetary Evolution, Velocity Distribution, Evaporation, Planetary Atmospheres
Scientific paper
The problem of calculating exospheric particle velocity distribution functions is solved by beginning with slightly disturbed equilibrium conditions at the lower boundary of the exosphere. These conditions are shown to be consistent with the requirement of energy-flux continuity and are employed to define the emission functions for upward propagating particles. The distribution functions of exospheric particles are determined by using the emission functions at the lower boundary and by taking into account the effect of collisions in the exosphere. The existence of exospheric particles moving in elliptic orbits that never penetrate the lower exospheric boundary is predicted, and the population of such orbits by exospheric particles is computed. The results are applied to estimate the flux of particles leaving the atmosphere from the exobase as well as to analyze the escape of hydrogen from earth's exosphere. Geocoronal Lyman-alpha observations are interpreted satisfactorily in terms of the investigated escape mechanism.
Fahr Hans Jörg
Weidner B.
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